New exhaust back box - need paste?

Done a quick search and can't find a definitive answer to this...

Got a new back box to fit (zs diesel) together with a new flange gasket - and exhaust past just in case.



Assuming I can clean up the old mating face ok (exhaust centre section)...

should I a) use gasket paste to get a good seal, b) try first without i.e. completely dry, only use paste if it blows, or c) smear light coat of something else (copper grease???).



Thoughts welcomed. Cheers.

Chris

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